FRQ — Equilibrium

Long answer·Standard multi-step (3/5)·Calculator allowed

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

For

\mathrm{N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g)}

, an equilibrium mixture at a fixed temperature has

[\mathrm{N_2}]=0.50\,\mathrm{M}

[\mathrm{H_2}]=1.0\,\mathrm{M}

and

[\mathrm{NH_3}]=0.20\,\mathrm{M}

Total: 5 marks

(a) Calculate $K_c$ . (2 marks)

(b) If another mixture at the same temperature has $Q_c=0.20$ , state the direction of shift. (2 marks)

Your response (optional — you can also work on paper)

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